Hey John, You say you run your shop off of the 24v setup….. do you have an inverter that makes 120VAC? Or 240VAC? Seems to me that all you need is an inverter and a charger. There would be some losses but simple to implement. If you go straight to the battery from the array you could use a DC to DC converter. Not sure of availability at those voltages. Let me think a bit and I’ll back to you. Paul
Sent from AT&T Yahoo Mail for iPhone On Friday, January 12, 2024, 9:21 PM, John McIntire via EV <ev@lists.evdl.org> wrote: Having read this list for several years now, and commented occasionally, I know there some electrical engineers out there. It is to you I address this problem. I am now the proud owner of a '96 Solectria Force which will be receiving a new battery made up of 48, 280A LiFePo4 prismatic cells. The Force was designed to run at 156v (13 lead acid batteries). My primary power source is a 16 panel, 8.5 Kw PV array. Max voltage under load is 43v/panel at 13A. There is no back up power as I am not grid tied. I do have a small domestic 24v Li battery to run my shop. The Force battery will be equipped with a robust BMS. I can configure the panels to provide 172v at 52A in full sun but I know that the voltage and amp will be unstable which does not promote longevity in Li cells. Normal circumstances have a charge controller between the battery and the array to even out the voltage. Normal charge controllers are 48v or less. I would like to find or build a buck/boost circuit that would match the battery. I think I could break the Force battery into 3, 16s packs, charge them parallel at 48v+ and then reconnect in series for discharge. I think 2 contactors per pack along with appropriate safety devices would do the job but that seems cumbersome at best if workable. I am not an engineer. I do have 30 years experience with automotive electronics. Since partial retirement, over the past 15 years I have converted an S-10 and 2 tractors to run as EVs. So I am somewhat familiar with the concepts and pitfalls. I would appreciate your thoughts and suggestions. Thanks in advance. John M "Money doesn't talk, it swears"--Bob Dylan _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/ -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20240113/c226d4e6/attachment.htm> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
