≈ 1.7 days (24h/day) · Safe motor start buffer (55.6% margin).
1/2 HP well pump running (1,250 W max) and start-up (3,800 W max) draw fit the Goal Zero Yeti PRO 4000's 3,600 W continuous / 7,200 W surge ratings.
shallow water table with low head pressure demand (850 W run, 2,500 W surge)
standard 100-ft deep residential well cycling on 30/50 PSI pressure switch (1,050 W run, 3,200 W surge)
deep drawdown or continuous tank refill against high head pressure (1,250 W run, 3,800 W surge)
≈ 1.7 days (24h/day)
System standby power: 22W (22.1% of total draw)
Provides 4× CEE 7/3 (230V), 1× IEC Commando (32A) (120V 60Hz).
Pure sine wave inverter output. Safe for sensitive medical electronics and variable-speed motors.
Inductive motor/compressor load with 3× starting surge (motor inrush) (55.6% worst-case surge margin).
Wall AC fast charge at up to 1800W (120m to 80%, 150m to 100%).
Safe envelope verified: Starting surge (3200W) remains comfortably below the 7200W surge trip line, with steady-state operation settling into the safe continuous zone at 1050W.
About 40 hours on AC power, with the 1/2 HP well pump averaging 70 W (standard 100-ft deep residential well cycling on 30/50 PSI pressure switch (1,050 W run, 3,200 W surge)). The Goal Zero Yeti PRO 4000 then draws about 100 W from its battery, including 22 W for the inverter itself. Best case: about 3.7 days (shallow water table with low head pressure demand (850 W run, 2,500 W surge)). Worst case: about 13.3 hours (deep drawdown or continuous tank refill against high head pressure (1,250 W run, 3,800 W surge)).
Yes. The 1/2 HP well pump's start-up peak of about 3,200 W (up to 3,800 W) fits within the Goal Zero Yeti PRO 4000's 7,200 W surge rating, with 47% headroom even in the worst case.
That simple division gives 57 hours, but the Goal Zero Yeti PRO 4000's inverter draws about 22 W whenever its AC outlets are on. At this light load that's 22% of everything the battery supplies, and inverter conversion losses take a further share. The idle figure comes from Goal Zero.
On wall power: about 120 minutes to 80% and 150 minutes to full (Goal Zero figures). With its maximum 3,000 W of solar input connected, expect about 2,400 W in full sun, so a full recharge takes roughly 1.8 hours of full sun, so it can refill in a single day with 4 peak sun hours.
Statutory 30-day retail price announcements & rate revisions
Bord Gáis Energy winter rate adjustment: +1.60c/kWh Day, +0.90c/kWh Boost (2am–5am), and +€12.50/yr standing charge effective 20 Nov 2026.
Energia retail revision: +1.85c/kWh Day, +1.15c/kWh EV Boost (2am–6am), and +€14.20/yr standing charge effective 15 Nov 2026.
Dual Fuel Day Night: Day -4.64c/kWh, Night -3.25c/kWh (effective 2026-11-05)
Electricity Day Night: Day -4.64c/kWh, Night -3.25c/kWh (effective 2026-11-05)
SSE Airtricity statutory price cut: -1.25c/kWh Day, -0.65c/kWh Night, and -€8.40/yr standing charge effective 01 Oct 2026.
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