Thinking of getting an e bike, 320wh battery, 4a /48v charger. Would like to be able to charge it whilst away without EHU.
Van has a 150ah battery, doesn’t work very well below 50% capacity.
Have a 1600w inverter that outputs to mains equivalent. And a solar panel.
How much of my leisure battery capacity would be used up charging the bike? Assuming 15% losses on each of the inverter and the battery, I get 40ah but would appreciate someone working this out. Can you show your maths so I can see if I can remember anything from my education?
Thanks in advance
errr... 150ah x (I'm assuming 12v) = 1800wh, half of that is 900wh, which gives you plenty of leeway to charge a 320wh battery even assuming those (sound fairly large) losses? Depends what else is drawing power at the same time from the leisure battery though I guess.
Thanks - it would be lights, devices charging using the battery so sounds like it would be fine?
How old is your leisure battery? Mines nothing like what it used to be and needs replacing this year.
Do you also want it to run your fridge etc? If so for how long?
Do you have solar panels?
Is the van going to be parked a while or used every day for the relay charger to top up the battery?
Fridge runs off gas and have a solar panel.
Battery is about 4 years old. It gets trickle charged by solar panel.
I would have thought the longest time it would be parked without being moved would be 3 days. So would only be able to fully charge it once I guess.
We have done ours during the day. Have 2 leisure batteries and a big solar panel on the roof. No problems via the inverter but I wouldn't like to risk it during the winter months
You will draw 30ah from your battery, (320w / 12) x 1.15 = 30.66ah
You need (48v x 4a) x 1.15 = 220.8w of power from your inverter , allowing for redundancy I would say minimum 500w inverter and it needs to be a good quality pure sine wave inverter.
If you can get a 12v vehicle charger for the ebike that would be a lot more efficient than converting 12v to 230v and then back to 52v.