How to Modify the SearchServiceApplication MaxRowLimit using Powershell Script

Decompiling the SearchServiceApplication we see that MaxRowLimit on that application defaults to 500 and that value is passed to the query.

The SearchServiceApplication MaxRowLimit can be modified as follows:

PS> $ssa = Get-SPEnterpriseSearchServiceApplication
PS> $ssa.MaxRowLimit = 1000
PS> $ssa.Update()
PS> iisreset