Hey!

I’m looking to buy a “solar battery” mainly to use as UPS/backup and for kinda-sorta arbitrage, since night off-peak tariffs are 1/3 of day ones.

My work desk is burning around 100w idle and 200-250w when I use it, plus extra 30-40w from network equipment.

From time to time we have brief outages, usually less than hour long, but I’m aiming for 2-3 hours of runtime for desk only.

Also. Given the amount and severity of heat waves if blackout happens when it’s +35°C outside I’d like to use it to run my 2kW peak rated inverter AC. On weekend we’ll have +37°C and I’ll measure consumption to get better idea how much it chugging

Optionally, put up few panels on my balcony, though it gets just 4-6 hours of direct sunlight during the summer. I might have space for 500w at best. Maaaybe, I can get a green light to put a bit more at the roof of our building, but I’m not counting on that

My other requirements:

• anti-islanding protection
• be quiet under <300w load
• charging scheduling and capacity management (charge at night, discharge during the day until X% left). Or BLE/WiFi controls, so I can hack this myself
• can be sourced in DE (I have forwarding company that can ship it to me for reasonable price)

I’m looking at OUPES Mega 1 or AFERIY Nomad1800 Pro

Reasons mainly:

• Nominal ratings are close to peak AC rated power and surge covers well over that
• very cheap: ~450€ for ~1kW•h)
• can be expanded with extra batteries. However availability of OUPES B2 battery in EU is not clear and I’m still waiting for theirs pre-sale dept response
• ~20ms switch time

My uneducated research found only real downside of cheapo power stations is self-consumption and rough edges on warranty side. Warranty is, well, not much use for me, as I’m not in EU

And tbf I’m fine with ~80% round-trip efficiency and 10% discharge rate.

Any recommendations? Maybe I’m missing something? Any feedback is much appreciated!

#solar #solarpower #offgrid

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