Originally 24v, but switched to 48v a few years ago. There's not a huge difference, but the batteries seem to hold up a little longer w/48v. We purchased used hospital back up system lithium 24v batteries. Most hospitals replace them at 90%. This was the best upgrade hands down and very reasonable. 4 of them peplaced a bank of 20 lead acid batteries and perform way better. There's a website that sells them $3-400 each(when in stock). I can post if anyone is interested.
Originally 24v, but switched to 48v a few years ago. There's not a huge difference, but the batteries seem to hold up a little longer w/48v. We purchased used hospital back up system lithium 24v batteries. Most hospitals replace them at 90%. This was the best upgrade hands down and very reasonable. 4 of them peplaced a bank of 20 lead acid batteries and perform way better. There's a website that sells them $3-400 each(when in stock). I can post if anyone is interested.
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