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Wetin dey spoil the pump?

Not old age. Voltage. Sag or blow the transformer and watch a real 1 HP motor model heat, fail, or survive — minute by minute, in naira.

AWAITING PREDICTION

Drag to orbit · click the transformer, pump, relay or tank to inspect it.

Supply230 V

Motor current0.00 A

Winding32 °C

Tank150 L

Spend₦0

With your current setup, does the pump take damage on this day?

Grid scenario — what the transformer gives you today

Winding °C + supply V · one dayRUN A DAY TO SAMPLE THE MODEL

Pick a grid scenario, commit to a prediction, then run the day. The model integrates the winding temperature every simulated minute — nothing here is a canned animation.

Mastery0 / 3

₦0 spent of the post's ₦50,000 frame. One rewind is ₦35,000 — the claim survives exactly one burnout.

Why LOW voltage burns motors

A loaded induction motor is close to a constant-power machine: it must deliver the same lifting work whatever the line gives it. So when the transformer sags, the motor compensates by drawing more current — I = P ÷ (V × pf). Heat in the winding rises with current squared. And a submersible pump has one more cruelty: it is cooled by the water it pumps, and low voltage pumps less water.

230 V → 5.09 A995 W ÷ (230 × 0.85). Steady winding 85 °C. Safe all day, every day.

180 V → 6.50 ASame arithmetic, +28% current, heat ×1.63, cooling flow down to 13.3 L/min.

167 °C steady statePast the 150 °C insulation limit — crossed at minute 52 of the sag day in this model.

−₦35,000One rewind. The 'less than 50k' claim is true exactly once per burnout.

The blown transformer's real weapon

The outage itself is almost kind to the motor — 0 V heats nothing. The damage comes when light returns: the reclose transient (modeled here as a 320 V spike) punctures winding insulation in milliseconds. That is why a pump can "spoil" on the very evening NEPA brings the light back, and why the fix keeps repeating for people on a sick transformer. Protection matters at the moment of reconnection, not during the darkness.

What ₦50,000 actually buys

The model runs the same 14-day fortnight — eleven stable days, two sag days, one blown-transformer day — once with a bare pump and once behind a ₦15,000 out-of-range cutoff relay. Same weather, same grid, same household drawing 2,000 L a day.

Fortnight strategy	Burnouts	Repair + protection spend	Hours with a dry tank
No protection	…	…	…
₦15,000 relay installed	…	…	…

…

Two beliefs this model breaks

"Low voltage is gentle — things just run weaker." Constant-power loads compensate. The sag day pushes 6.50 A through a winding built for 5.09 A while halving its cooling. Run it above and watch the amber trace cross the red line.

"Blown transformer means nothing to fix — there's no power at all." Run the blown day unprotected. The winding stays cool for ten hours, then dies in one minute — at reconnection, not during the outage.

Same line, different machine

Your fridge compressor sits on the same sagging 180 V line tonight. It is the same kind of constant-power induction motor as the borehole pump. What actually protects it?

Educational model with indicative Nigerian market prices (rewind ≈ ₦35,000, cutoff relay ≈ ₦15,000 as of mid-2026) and a generic 1 HP single-phase submersible pump: no starting-capacitor dynamics, three-phase supplies, or site-specific head curves. It teaches the physics of the argument; it does not replace a licensed electrician for any real installation.