electric bikes

Submitted: Monday, Aug 06, 2012 at 14:28
ThreadID: 97293 Views:1371 Replies:2 FollowUps:1
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Have just brought 2 very good second hand e-bikes [36 volt] and as a result I am qurious as to charging of existing 12v solar systerms...I have a 200W panel with 2 105 Hph batteries ... need to go 12v =36v..... supplyed with 1.5Amp chargers... My onley thought is to use a 2000W Inverter which seems a wast of enegy ? Has any one any bright idears thanks
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Reply By: PeterInSa - Monday, Aug 06, 2012 at 14:55

Monday, Aug 06, 2012 at 14:55
Mate had a similar setup, not sure how it happened but middle battery did not get enough charge, he looked into setting up to charge the 3 x12volt batteries in parallel. In the end found that all came up to 12volt but questioned their capacity for longish trips.

Bought 3 new batteries and short time later sold the bike, so someone got a bargin at $500.

But may be worth looking at electrically separating the batteries for charging say each with one of those $10 sola chargers (on special). Maybe one small panel will keep 3 batteries topped up. When we go touring connect one of these small panels to our small car Battery and its full charged when we return home.

To me the 1.5 amp chargers could be overkill and dry up the electrolyte if left on 24/7 maybe put them on a timer. But its not a set and forget situation

Peter
AnswerID: 492381

Reply By: Aussie Noel - Tuesday, Aug 07, 2012 at 09:11

Tuesday, Aug 07, 2012 at 09:11
Hi David We have a 36volt electric bike for about 5 years, we charge it off a small inverter off the trucks batteries when the sun is on our solar panels. We have had no problems but what you must remember is that inverters are more efficient when they are running above 80% load, so buy yourself a small inverter about 20% bigger than what your charger requires , they are cheap as chips on ebay these days. If in the future you have any problems with a single battery in your bike you must buy 3 new ones as the internal resistance changes therefore altering the charge rate of the other batteries. Regards Aussie Noel
AnswerID: 492442

Follow Up By: david s27 - Tuesday, Aug 07, 2012 at 17:15

Tuesday, Aug 07, 2012 at 17:15
Many thanks Noel
Cheers David
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