Jason, this is the solution I was also thinking about bringing up. I wonder if it would require a change in programming every time the battery was disconnected/reconnected. If it does need a program change, that makes it much less desirable. But it could still work. The DIY/ system cobbling type might not be opposed to changing the programming when/if the need arises to switch to battery mode.
Slight tangent: A youtuber named Will Prowse did a variation on this, using a lithium battery pack in the golf car, and he mounted an All-In-One Chinese inverter (MPPT brand, but similar to Sol-Ark/ Grow Watt) in the golf cart to be the battery charger, and mobile power source in a relatively lightweight package. He is very much in line with the DIY/cobble it together type demographic: Just look for Will Prowse Golf Cart on youtube. Worth a look during lunch time at least😊 -- Danny Young Engineering Team Lead Solar Energy Solutions Lexington | Louisville | Bloomington | Cincinnati | Evansville | Indianapolis 513-448-5176 (mobile) 877-312-7456 (Main Office) da...@sesre.com<mailto:da...@sesre.com> From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On Behalf Of Jason Szumlanski Sent: Wednesday, March 16, 2022 6:38 AM To: RE-wrenches <re-wrenches@lists.re-wrenches.org> Subject: Re: [RE-wrenches] Golf Cart as temporary off-grid PV What happens with a Sol-Ark 12k in grid-tie with battery backup mode when the battery "disappears?" Does it continue to operate in straight grid-tie mode with only AC connected and DC not present? Jason On Tue, Mar 15, 2022, 6:46 PM Jason Szumlanski <ja...@floridasolardesigngroup.com<mailto:ja...@floridasolardesigngroup.com>> wrote: That's what I was thinking- a MS4448 would be a nice option with a good surge rating. I'm trying to make this work with little to minimal equipment onboard the golf cart. Ideally, the battery would connect to a stationary inverter/charger at the house via a cable/connector. The PV would be permanently mounted also and would be grid-tied for times the battery is not connected. I am thinking this needs to be an AC coupled scenario with a grid-tie inverter that is AC coupled to the battery inverter. I'm hung up on how to safely connect the battery to the inverter (and more importantly, disconnect the battery from the inverter). Jason On Tue, Mar 15, 2022 at 6:29 PM Ray Walters <r...@solarray.com<mailto:r...@solarray.com>> wrote: Most carts run at 48vdc these days. They either have eight 6 volt batteries, or six 8 v batteries. I would think that would make a good match for power backup with a 4kw range inverter like the Magnum MS4448. Ray On 3/15/2022 12:18 PM, Nick A Lucchese wrote: > Not sure what the golf cart fleets are these days but decades ago as a > youngster I worked at a course where all the EZ-GO’s were 36v nominal with > all Trojan T-105’s. Also uncertain if still available or not but years ago > the first Cybo inverters I purchased were also intended for 36v nominal > battery banks. Perhaps George and the team still offer that model. It’s > obviously a different type of architecture and I didn’t have any luck with > the 4 amp 36v charger on the inverter’s AC output that was promoted but > surely you could figure your means of charging with perhaps a Flexmax or > similar. I had some issues with the hot water heater model but the off grid > model consistently performed it’s inverting function assuming there was a fan > or some sort of resistive or inductive load to keep the inverter awake. The > only other 36v inverter I can think of was the Heart Transverter which was a > big loss for a few of us. > > https://www.cyboenergy.com/products/offgridoverview.html > > Best of luck Jason, Nick > > > > >> On Mar 14, 2022, at 3:48 PM, Jason Szumlanski >> <ja...@floridasolardesigngroup.com<mailto:ja...@floridasolardesigngroup.com>> >> wrote: >> >> Every now and then I get questions here in the land of hurricanes and golf >> courses about using golf carts as the battery bank for a permanently mounted >> grid-tie home PV system in a backup scenario. Does anyone have any ideas on >> a good way to do something like this? The battery would need to be able to >> be unplugged of course (not under load I hope!) It's mostly DIY'ers trying >> to cobble together a solution for a small critical load panel for their home. >> >> The idea is becoming more popular as people hear about using EVs for home >> backup. I'd like to get ahead of it and maybe even offer a solution that's >> safe, legal, and functional. >> >> Jason Szumlanski >> Florida Solar Design Group >> _______________________________________________
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