Electrics also have limits on what you may apply with them. If you want them to last any length of time it is clear, water based solutions like RoundUp or Three Way amine only. Solvent based sprays or the wettable granule chemicals introduce a wear factor. Fl. I caught what you said about a Delavan pump for your shrub rig. For me, that would be run off of a Hypro D252 and a Honda Engine.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738