I've driven my 914ev 1,203 miles so far this year

[David Shields]

I've had a lot of fun with my 914 EV this year. The only problem I've had is getting it to charge quickly. I put new AGM batteries in it and after that I just can't get it to charge in 8 or 9 hours like it used to.

Any suggestions?

#	Charge Date	Odometer Mileage	Hours to Charge	Miles Driven	Notes
1	2/25/2017	44,717	12	16.6
2	2/27/2017	44,732	12	17.4
3	3/9/2017	44,764	< 15	32
4	3/19/2017	44,788	13	24.3
5	3/22/2017	44,805	≤ 12	16.7
6	3/26/2017	44,824	≤ 12	19.1	Charged away from home.
7	3/28/2017	44,840	≤ 12	16.5
8	4/2/2017	44,861	≤ 12	20.6
9	4/13/2017	44,889	14.5	28.3	Charged away from home.
10	4/14/2017	44,910	≤ 13	21.2
11	4/21/2017	44,939	≤ 14	28.4
12	4/23/2017	44,955	≤ 15	15.7
13	4/27/2017	44,981	≤ 12.5	26.2
14	5/3/2017	44,997	< 12	16.7
15	5/13/2017	45,019	≤ 13	21.4
16	5/15/2017	45,048	> 14	29.4
17	5/16/2017	45,068	≤ 15	19.2
18	5/17/2017	45,089	≤ 12.5	20.8
19	5/26/2017	45,114	< 13.5	25.6
20	5/29/2017	45,131	≤ 11	17.2
21	6/1/2017	45,146	≤ 12	15.2
22	6/2/2017	45,170	9	23.2
23	6/8/2017	45,194	?	24.7	Gave up and went to bed after 11 hours
24	6/10/2017	45,212	≤ 11	18
25	6/20/2017	45,233	≤ 12	21
26	6/25/2017	45,257	≤ 13.5	24	Charged away from home.
27	6/26/2017	45,286	≤ 14	28.3
28	7/16/2017	45,306	≤ 14	20.7	Charged away from home.
29	7/25/2017	45,324	≤ 11.75	18
30	7/29/2017	45,340	≤ 11	15.9
31	7/30/2017	45,356	≤ 12	15.6
32	8/4/2017	45,378	?	21.7	Only 70% Charge after 12 hours.
33	8/6/2017	45,393	≤ 14	15.4
34	8/9/2017	45,412	≤ 13	18.7	Charged away from home.
35	8/10/2017	45,435	≤ 14	23.5
36	8/13/2017	45,457	≤ 14	22.1
37	8/14/2017	45,475	≤ 14	17.9
38	8/22/2017	45,491	≤ 14	15.8
39	8/23/2017	45,503	≤ 12	11.8
40	8/24/2017	45,521	≤ 12	18.1
41	8/27/2017	45,538	< 11	17.6	Charged away from home.
42	8/30/2017	45,565	14.5	26.8
43	8/31/2017	45,574	?	8.9
44	9/6/2017	45,587	≤ 10.5	12.5	Reprogrammed Elcon  Charger to 4 blinks instead of 5.
45	9/7/2017	45,603	≤ 12	16.5
46	9/8/2017	45,620	< 11	16.7
47	9/9/2017	45,642	≤ 12	21.8
48	9/10/2017	45,661	≥ 12	19.1
49	9/17/2017	45,678	≥ 12	16.8
50	9/20/2017	45,688	≥ 12	10.1	Charged away from home.
51	9/21/2017	45,713	≤ 15	25.5
52	9/22/2017	45,732	<15	19.3
53	9/24/2017	45,749	≤13	16.1
54	9/25/2017	45,766	≤11	17.3
55	9/29/2017	45,781	≤14.5	15
56	10/1/2017	45,807	≤ 12	25.8
57	10/3/2017	45,825	≤ 12	18.3
58	10/4/2017	45,836	≤ 12	10.8
59	10/14/2017	45,847	< 11.5	11.1
60	10/17/2017	45,865	?	18.4	I fell asleep and let it go all night. 21 hours total.
61	10/19/2017	45,883	≤ 12	17.9
62	10/22/2017	45,903	≤ 12	19.9
63
64
65

[David Hale]

What is the capacity of the battery pack, how many Wh/mi do you consume, and what is the power output of the charger?

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[David Shields]

I'm using (10) 12 volt, 100 amp hour AGM lead acid batteries for 120 volts. I have an Elcon on-board charger.

I need to buy a meter to measure the output of the charger. I suspect that is the next logical step.

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From: 91...@googlegroups.com <91...@googlegroups.com> on behalf of David Hale <astrono...@gmail.com>
Sent: Thursday, November 2, 2017 9:26 PM
To: 914ev
Subject: Re: [914ev] I've driven my 914ev 1,203 miles so far this year

 

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[eyec...@aol.com]

Hi Dave

If you don't mind me asking.

What % of charge are you looking to replace at charging

George Ozer

Sent from my LG G3, an AT&T 4G LTE smartphone

------ Original message------

From: David Shields

Date: Fri, Nov 3, 2017 5:34 AM

To: 91...@googlegroups.com;

Subject:Re: [914ev] I've driven my 914ev 1,203 miles so far this year

I'm using (10) 12 volt, 100 amp hour AGM lead acid batteries for 120 volts. I have an Elcon on-board charger.

I need to buy a meter to measure the output of the charger. I suspect that is the next logical step.

From: 91...@googlegroups.com <91...@googlegroups.com> on behalf of David Hale >

[David Hale]

A clamp on ammeter wouldn't hurt to have to confirm the charger is working, but for now, what is the *rated* output of the charger? Here's where I'm going with this; let's say the car uses 200 Wh/mi. After your 20 mi trip you'd have used 4000 Wh that you need to replace. An Elcon 2500 should be able to do that in about 5h on 110vac, half that on 220vac.

[David Shields]

I don't have an ammeter but I do have a shunt for one. I use a state of charge meter for my "gas gauge".

The manual shows a DC nominal output voltage of 120 volts at 9 amps.

I charge on 110vac.

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From: 91...@googlegroups.com <91...@googlegroups.com> on behalf of David Hale <astrono...@gmail.com>

Sent: Friday, November 3, 2017 1:17 PM

To: 914ev
Subject: Re: [914ev] I've driven my 914ev 1,203 miles so far this year

A clamp on ammeter wouldn't hurt to have to confirm the charger is working, but for now, what is the *rated* output of the charger? Here's where I'm going with this; let's say the car uses 200 Wh/mi. After your 20 mi trip you'd have used 4000 Wh that you need to replace. An Elcon 2500 should be able to do that in about 5h on 110vac, half that on 220vac.

--

[David Hale]

9A @ 120v is 1kW so you should be able to replace a 20 mi drive in ~ 4 hr. Maybe your charger is doing some kind of "equalizing" that takes several hours? Maybe you're using more than 200 Wh/mi. But you're talking about 12 hr charge times, a factor of three from my estimate, so seems unlikely you're using ~ 600 Wh/mi. Maybe a combination of the above two things? Try to find out from Elcon exactly what your charger is doing, if you're using one of their charge curves.

On Fri, Nov 3, 2017 at 8:26 AM, David Shields <dshie...@hotmail.com> wrote:

I don't have an ammeter but I do have a shunt for one. I use a state of charge meter for my "gas gauge".

The manual shows a DC nominal output voltage of 120 volts at 9 amps.

I charge on 110vac.

---

From: 91...@googlegroups.com <91...@googlegroups.com> on behalf of David Hale <astrono...@gmail.com>
Sent: Friday, November 3, 2017 1:17 PM
To: 914ev
Subject: Re: [914ev] I've driven my 914ev 1,203 miles so far this year

 

A clamp on ammeter wouldn't hurt to have to confirm the charger is working, but for now, what is the *rated* output of the charger? Here's where I'm going with this; let's say the car uses 200 Wh/mi. After your 20 mi trip you'd have used 4000 Wh that you need to replace. An Elcon 2500 should be able to do that in about 5h on 110vac, half that on 220vac.

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[David Shields]

I'm going to put a meter on it and then have a little talk with
Elcon (again).

Thanks for the input David.

---

From: 91...@googlegroups.com <91...@googlegroups.com> on behalf of David Hale <astrono...@gmail.com>

Sent: Friday, November 3, 2017 3:35 PM

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[David Hale]

For what it's worth, I didn't make up the 200 Wh/mi figure; that's approximately what my car uses. Dave.

[Stephen Federico]

So glad to see some posts, I feel like I'm so late to the party on this group, having just recently joined. Here's my 914 after my "looks good from 7-12 feet away" paint job done in my garage during the Napa fires. Didn't know if we were going to have to evacuate and leave it behind for a while there, but thanks to our heroic firefighters, came through OK.

Keep the rubber side down my fellow 914ev-ers!

Stephen

[David Shields]

I've always liked the people in the 914ev group. Such a wealth of knowledge.

Here's mine from 7-12 feet away.

I'm going to drive it today.

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Sent: Saturday, November 4, 2017 2:46 AM
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[Phillip Binley]

Hello just to let you know this message is a real shoot in the dark.  I have a modified 914 that is converted to electric and represents one too many projects in my garage/workshop and I was hoping that you might be able to provide contact information on anyone who might be interested in my 914 conversion.  In an attempt to minimize the weight to car has been gutted and is even without a windshield.  This car is not for anyone who wants a “regulation compliant daily commuter”.   This car might be appealing to a tinker, a school auto shop or someone looking for a project to play with.  It is also a collection of both electrical and mechanical components.  Some money exchange would be nice but not necessary.  I kept myself busy for a couple of years; I met lots of nice people but now it is time to move on and making space in my shop has become a priority.   Phil Binley, Bolinas, CA

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From: David Hale <astrono...@gmail.com>
To: 914ev <91...@googlegroups.com>
Sent: Friday, November 3, 2017 8:35 AM

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