bobbie-vault/Notes/2026-01-25 1428 Home and van battery upgrades.md

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category	type	title	created	date	tags
Journal	Log	Home and van battery upgrades	2026-01-25T14:28:52	2026-01-25	research

So my general plan for increasing the capacity of the house battery and also being able to use that in the van while camping.

• House side
  • EcoFlow STREAM Microinverter
    • £99
    • MPPT range
      • 16-60v dc
    • Start-up voltage
      • 20v
  • Batteries
    • 12v, minimum of 2 to achieve MPPT start-up voltage
      • 12v 100 Ah = 1.3 kWh @ £160 = £125 / kWh (frogstar)
      • 12v 280 Ah = 3.6 kWh @ £360 = £100 / kWh (eco-worthy)
      • 12v 314 Ah = 4.2 kWh @ £450 = £107 / kWh (frogstar)
      • 12v 460 Ah = 5.9 kWh @ £600 = £101 / kWh (frogstar)
  • Charger
    • This maybe the limiting factor here, how much kW over cheap rate
      • 24v 40A = ~1.0 kW @ £135 (frogstar) = 5.0 kWh (in 5 hrs)
      • 48v 35A = ~1.9 kW @ £150 (frogstar) = 9.5 kWh (in 5 hrs)
• Van side
  • renology mppt dc-dc charge controller 50A @ ~£200
  • charge the ecoflow off van service battery (will be slow, but constant)

@ 2 x 280 Ah batteries (7.2 kWh capacity) £1,155 total