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I'd say a cheap charger-inverter like a Sungold or SRNE would clean this up quite a bit. You'd also not have to size a surge suppressor to withstand the inrush current since the inverter would be supplying the load. It would have a generator input on top of all that. And IDK what sort of inverter you have there, but a lot of those style are modified sinewave and not very good on motors. You'd also get a good data feed off the CI for monitoring, and a dry contact for an alarm siren if the battery hit critical.
But I like the DIY route, those purpose built backups seem ridiculously expensive to me.
The all-in-ones are nice, but expensive. I specifically went with high quality (but individually purposed) components, to save some money and also make repairs and replacements easier & cheaper.
The inverter is an AIMS pure sine wave (not modified) rated to 2000w continuous and 4000w peak. I chose it so that I could safely throw any consumer sump pump rated for a 15amp receptacle at it without worry. If you're careful and considerate, you could downgrade to a 1500w/3000w or even 1000w/2000w inverter if you're positive the pumps won't exceed the limits (would work on smaller 1/3hp systems, etc).
The current setup handles my Zoeller M95 that peaks at 16.5A with ease.
Regarding monitoring, the white cables are ZWave devices, I have set up to measure current and power draw.